title: Differential interactions of the growth factor receptor-bound protein 2 N-SH3 domain with son of sevenless and dynamin. Potential role in the Ras-dependent signaling pathway.
abstract: In this paper, we show that the 36-45 surface-exposed sequence WYKAELNGKD of growth factor receptor-bound protein 2 (Grb2) N-SH3 domain inhibits the interaction between Grb2 and a 97-kDa protein identified as dynamin. Moreover, the peptide GPPPQVPSRPNR from dynamin also blocks the binding of dynamin to the proline-rich recognition platform of Grb2. Mutations in the 36-45 motif show that Glu-40 is critical for dynamin recognition. These observations were confirmed by immunoprecipitation experiments, carried out using ER 22 cells. It was also observed that the proline-rich peptide from dynamin was unable to dissociate the Grb2.Sos complex, whereas the proline-rich peptide from Son of sevenless (Sos) inhibited Grb2. dynamin interaction. A time-dependent stimulation of epidermal growth factor receptor overexpressing clone 22 (ER 22) cells by epidermal growth factor resulted in an immediate increase of the Grb2.Sos complex and a concomitant decrease in Grb2.dynamin. This suggests that the recruitment of Grb2.Sos to the membrane, triggered by epidermal growth factor stimulation, activates the Ras-dependent signaling and simultaneously enhances free dynamin levels, leading to both receptor internalization and endocytotic processes.
authors.affiliation: Département de Pharmacochimie Moléculaire et Structurale, U266 INSERM-URA D1500 CNRS, Université René Descartes-UFR des Sciences Pharmaceutiques et Biologiques 4, Avenue de l'Observatoire, 75270 Paris Cedex 06, France.
authors.forename: M
authors.initials: M
authors.lastname: Vidal
authors.forename: J L
authors.initials: JL
authors.lastname: Montiel
authors.forename: D
authors.initials: D
authors.lastname: Cussac
authors.forename: F
authors.initials: F
authors.lastname: Cornille
authors.forename: M
authors.initials: M
authors.lastname: Duchesne
authors.forename: F
authors.initials: F
authors.lastname: Parker
authors.forename: B
authors.initials: B
authors.lastname: Tocqué
authors.forename: B P
authors.initials: BP
authors.lastname: Roques
authors.forename: C
authors.initials: C
authors.lastname: Garbay
mesh_terms: D048868:Adaptor Proteins, Signal Transducing; D000818:Animals; D001667:Binding, Competitive; D006224:Cricetinae; D034281:Dynamins; D066246:ErbB Receptors / Q000235:genetics / Q000378:metabolism*; D005347:Fibroblasts / Q000166:cytology; D051380:GRB2 Adaptor Protein; D020558:GTP Phosphohydrolases / Q000378:metabolism*; D006801:Humans; D008565:Membrane Proteins / Q000378:metabolism*; D009842:Oligopeptides / Q000235:genetics / Q000494:pharmacology; D010446:Peptide Fragments / Q000235:genetics / Q000494:pharmacology; D011485:Protein Binding / Q000187:drug effects; D011506:Proteins / Q000235:genetics / Q000378:metabolism*; D011993:Recombinant Fusion Proteins; D015398:Signal Transduction; D020664:Son of Sevenless Proteins; D018909:src Homology Domains
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D051380:GRB2 Adaptor Protein; C495948:GRB2 protein, human; D008565:Membrane Proteins; D009842:Oligopeptides; D010446:Peptide Fragments; D011506:Proteins; D011993:Recombinant Fusion Proteins; D020664:Son of Sevenless Proteins; D066246:ErbB Receptors; D020558:GTP Phosphohydrolases; D034281:Dynamins